linux-kernel - Re: [PATCH 01/27] [AARCH64] Fix utmp struct for compatibility reasons.

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Message-ID: <CA+=Sn1nLp2_5mNTmG1=bKibGnkUWgBoOGf0DVxGRM2MkK3jQ4w@mail.gmail.com>
Date:	Thu, 23 Jun 2016 00:36:42 -0700
From:	Andrew Pinski <pinskia@...il.com>
To:	Andreas Schwab <schwab@...e.de>
Cc:	Yury Norov <ynorov@...iumnetworks.com>,
	Szabolcs Nagy <szabolcs.nagy@....com>,
	GNU C Library <libc-alpha@...rceware.org>,
	LKML <linux-kernel@...r.kernel.org>, nd <nd@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Marcus Shawcroft <marcus.shawcroft@....com>, philb@....org,
	David Miller <davem@...emloft.net>,
	Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
	"Joseph S. Myers" <joseph@...esourcery.com>,
	Andrew Pinski <apinski@...ium.com>
Subject: Re: [PATCH 01/27] [AARCH64] Fix utmp struct for compatibility reasons.

On Thu, Jun 23, 2016 at 12:32 AM, Andreas Schwab <schwab@...e.de> wrote:
> Andrew Pinski <pinskia@...il.com> writes:
>
>> So if you want aarch64 to be compatible with aarch32, you need to
>> define __WORDSIZE_TIME64_COMPAT32.  If we don't want aarch64 and
>> aarch32 to be compatible at all, then we can drop this patch or if you
>> don't want LP64 and ILP32 to be compatible either.
>
> Or go the other way like s390 and use the LP64 layout for ILP32.

That will solve the ILP32 side of things and I am ok with doing that
but not it does not solve that right now AARCH32 and AARCH64 are
incompatible.
You could say AARCH64 LP64 is currently broken because of this
incompatible but nobody has complained until now.

So the question becomes do we care enough about the incompatibles
between AARCH32 and AARCH64 to fix this and go just worry about ILP32
and LP64?

Thanks,
Andrew

>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@...e.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."